Yes, video is a part of content strategy and is very helpful for SEO ranking. From practical experience, I've seen that if I create a video titled after my keyword, the keyword has ranked withing 2 or 3 months. Therefore, video is a part of best content strategy for SEO ranking.

The fact that there is an option in Google search where you can search for videos means you should always try to have them. They might not bring a keyword ranking but will bring traffic to your website. And traffic is always good. So, yes videos are helpful.